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Treatment method of yellow phosphorus-contaminated soil

A treatment method and technology for contaminated soil, applied in the field of treatment of soil contaminated by yellow phosphorus, can solve the problems of no recovery value, inability to treat, and large amount of pollution, and achieve low secondary pollution risk, good reuse value, and treatment cost. low effect

Active Publication Date: 2017-01-25
中节能大地(杭州)环境修复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is that in the prior art, phosphorus sludge and phosphorus slag with high phosphorus content are mainly disposed of, and the disposal capacity is relatively small, while the yellow phosphorus content in general yellow phosphorus-polluted soil is relatively low, and there is no recycling value, but generally the amount of pollution is relatively large. At the same time, yellow phosphorus-contaminated soil contains many stones, which cannot be directly processed with ready-made equipment. General screening will cause yellow phosphorus to spontaneously ignite, thereby polluting the environment, which leads to the existing traditional None of the treatment technologies is suitable for dealing with the problem of yellow phosphorus-contaminated soil, and an optimized treatment method for yellow phosphorus-contaminated soil is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add an appropriate amount of water to 1000 kg of yellow phosphorus-contaminated soil to make the soil moisture content 25%, and use mechanical equipment to stir for 0.5 h. Then use a sieving machine to sieve to remove stones with a diameter of more than 3 cm. Put the sieved soil into the mixing equipment, add 50 kg of calcium hypochlorite (accounting for 5% of the soil quality polluted by yellow phosphorus), and stir for 0.5 h. Then add 100kg of powdered calcium hydroxide (accounting for 10% of the soil quality polluted by yellow phosphorus), and stir for 4 hours. Pile the treated soil on the hardened ground and let it stand for 10 days to react.

[0038] After testing, the yellow phosphorus content in the soil dropped from the initial 6.7% to 85 mg / kg after the treatment.

Embodiment 2

[0040] Add an appropriate amount of water to 1000 kg of yellow phosphorus-contaminated soil to make the soil moisture content 40%, and use mechanical equipment to stir for 1 h. Then use a sieving machine to sieve to remove stones with a diameter of more than 3 cm. Put the sieved soil into the mixing equipment, add 10 kg of hydrogen peroxide (accounting for 1% of the soil quality polluted by yellow phosphorus), and stir for 0.5 h. Then add 50 kg of sodium hydroxide (solution) (accounting for 5% of the soil quality contaminated by yellow phosphorus), and stir for 4 h. Pile the treated soil on the hardened ground and let it stand for 5 days to react.

[0041] After testing, the yellow phosphorus content in the soil dropped from the initial 6.7% to 63 mg / kg after the treatment.

Embodiment 3

[0043] Add an appropriate amount of water to 1000 kg of yellow phosphorus-contaminated soil to make the soil moisture content 30%, and use mechanical equipment to stir for 0.5 h. Then use a sieving machine to sieve to remove stones with a diameter of more than 3 cm. Put the sieved soil into the mixing equipment, add 20 kg of sodium hypochlorite solution (accounting for 2% of the soil quality polluted by yellow phosphorus), and stir for 0.5 h. Add 25 kg of potassium hydroxide (solution) (accounting for 2.5% of the soil quality contaminated by yellow phosphorus), and stir for 2 h. Pile the treated soil on the hardened ground and let it stand for 15 days to react.

[0044] After testing, the yellow phosphorus content in the soil dropped from the initial 6.7% to 137 mg / kg after the treatment.

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Abstract

The invention relates to a treatment method of yellow phosphorus-contaminated soil. The treatment method is characterized by stirring the yellow-phosphorus-contaminated soil into mud through a physical way and reasonably screening; firstly activating yellow phosphorus particles by using an oxidizing agent through the principle of chemical reaction, thereby increasing the specific surface area of the yellow phosphorus particles; converting high-toxicity yellow phosphorus into non-toxic phosphate through processes of disproportionation reaction and the like by using a disproportionation reactant, thereby realizing safe treatment of the yellow phosphorus-contaminated soil. The treatment method of the yellow phosphorus-contaminated soil, disclosed by the invention, can be used to effectively remove residual yellow phosphorus in the soil, and has the characteristics of safety and environment protection, low treatment cost, small secondary pollution risk and good treatment effect. The soil treated by the method has better reutilization value, contains higher-concentration phosphorus elements, and can be used as soil for green belts or forest land since physicochemical properties are not remarkably changed.

Description

technical field [0001] The invention belongs to the technical field of restoration of polluted soil, and in particular relates to a method for treating soil polluted by yellow phosphorus, which can effectively remove yellow phosphorus in soil, is safe and environmentally friendly, and has low treatment cost. Background technique [0002] Yellow phosphorus is a highly toxic substance with very stable chemical properties. If it is soaked in water or buried in underground soil, it will not degrade naturally even after decades or hundreds of years. When yellow phosphorus encounters air, it will slowly oxidize, and when the temperature exceeds 40 degrees, it will spontaneously ignite, producing a large amount of toxic smoke. [0003] Phosphorus mud, also known as mud phosphorus, is a by-product produced in the process of producing yellow phosphorus by electric furnace method. It is understood that for every ton of yellow phosphorus produced by the electric furnace method, 0.1t t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 张文辉肖愉吴竞宇杨圣鹏
Owner 中节能大地(杭州)环境修复有限公司
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